> For the complete documentation index, see [llms.txt](https://docs.resifactory.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.resifactory.net/reference/limits.md).
# Limits and retention
## Retention
**Settings → Retention** shows the current values for your server.
| Setting | What it governs |
| ----------------------- | ---------------------------------------------------------------------------------------------- |
| **Message retention** | How many days mail is kept. Older mail is pruned permanently. |
| **Audit log retention** | How long the record of credential reveals and exports is kept. |
| **Polling interval** | How often mailboxes are checked as a backstop. Most mail arrives by push well before any poll. |
{% hint style="warning" %}
Retention is a hard boundary. Once mail passes it, it is gone — not hidden, not archived. If you need mail kept longer, pull it over IMAP into your own storage or export the [Inbox](/the-console/inbox.md) as CSV.
{% endhint %}
**Retention is not the** [**inbox window**](/imap/inbox-window.md)**.** Retention is how long mail is kept; the window is how much of what is kept a given credential is shown. Widening a window brings mail back; nothing brings back mail that has passed retention.
## Inbox window presets
The nine choices, in minutes:
| Preset | Minutes |
| --------------- | ------- |
| Unlimited | — |
| Last 3 months | 129,600 |
| Last 1 month | 43,200 |
| Last 14 days | 20,160 |
| Last 7 days | 10,080 |
| Last 24 hours | 1,440 |
| Last 6 hours | 360 |
| Last 1 hour | 60 |
| Last 15 minutes | 15 |
These are the only values; there is no free-text option.
## IMAP
| | |
| ------------------ | ------------------------------------------------------------- |
| **Host** | `mail.resifactory.net` |
| **Port** | `993` only |
| **Encryption** | Implicit TLS. No STARTTLS, no plaintext, nothing on port 143. |
| **Folders** | Exactly one: `INBOX` |
| **Outgoing** | None. The server does not send mail. |
| **Search nesting** | `OR` / `NOT` up to 16 levels deep |
| **Flags** | `\Seen` `\Answered` `\Flagged` `\Deleted` `\Draft` |
Full detail: [What the server supports](/imap/capabilities.md).
### Very large mailboxes
Enumerating an enormous mailbox is bounded — an unlimited-window credential over a very large set of mail may not be able to address every message by sequence number.
In practice this only matters if you run **Unlimited** on a large, old set of mailboxes. Setting any [inbox window](/imap/inbox-window.md) removes the concern entirely, and is faster besides. It is another reason the window is the first thing we recommend.
## Authentication
| | |
| ------------------------ | ---------------------------------------------------------------------------------------------------- |
| **App password display** | Shown once at creation. Stored hashed; never retrievable. |
| **Failed-login lockout** | Repeated failures temporarily block further attempts from that username and IP. A success clears it. |
| **Revocation** | Immediate. Live sessions are disconnected at once. |
| **IP allowlist** | CIDR ranges per app password. Outside them, rejected exactly like a wrong password. |
| **Sign-in password** | Minimum 12 characters. Changing it signs out every web session. |
| **Password-reset code** | 6 digits, expires in 10 minutes, single use. |
## Account limits
| | |
| ------------------------------ | ---------------------------------------------------------------------------------------------- |
| **Mailboxes per app password** | No limit. A unified credential covers everything you own. |
| **App passwords** | No practical limit. Make one per tool. |
| **Batches** | No practical limit. A mailbox can be in several. |
| **Catch-all domains** | Add as many as you control. |
| **Purchase quantity** | The [buy-more card](/buying-more/buying-more.md) will price up to a maximum; beyond that, ask. |
## What is not limited
* **Connections** — but one connection in `IDLE` beats several polling, every time.
* **Searches** — though refused criteria come back as `NO [CANNOT]` rather than a wrong answer. See [What the server supports](/imap/capabilities.md).
* **Exports** — every one is recorded.
---
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